Black, White, & Bone: Understanding Your Horse's Radiographs

Written by University of Florida veterinary student, Abby Uhrinek

Radiographs, more commonly called x-rays, are an important part of your horse’s health and wellbeing. These images help us evaluate normal anatomy, especially in the limbs and head. Even more importantly, they allow us to identify disease and make informed treatment decisions.

When we take radiographs, you may notice several pieces of equipment involved. One device generates the x-ray beam, which passes through your horse’s body. On the opposite side, a digital plate captures the image. The result is a picture that highlights differences in tissue density, which is most notably, bone.

A helpful way to think about radiographs is as a shadow picture. Dense structures, like bone, absorb more x-rays and appear white. Less dense structures, like air, appear black. The various shades of black and white represent different tissues. These differences in black and white enable us to identify where disease may be present, and when normal begins to look abnormal.

Why are Radiographs Recommended? There are many reasons we may recommend radiographs: In the limbs, they are commonly used during lameness evaluations, after acute injuries, or when investigating chronic performance issues. One of the most common reasons for radiographs is for the evaluation of laminitis, a painful inflammation inside the hoof that makes standing and walking difficult. Radiographs allow us to assess for sinking, rotation, and chronic remodeling of the bone within the hoof, changes that help determine severity. These images will not only guide medical treatment but also help your farrier tailor trimming and shoeing to best support your horse.

It’s important to understand that radiographs do have limitations. While they are excellent for identifying fractures, arthritis, laminitis, and other bone-related conditions, they do not allow us to see soft tissue structures such as tendons, ligaments, or cartilage. In addition, some diseases are simply too early to detect. Radiographic changes can lag behind symptoms by up to two weeks, meaning repeat imaging may sometimes be necessary.

Skull radiographs present an additional challenge because the equine head contains many overlapping structures. This “stacking” of anatomy, called superimposition, can occasionally make interpretation more complex. In some cases, consultation with a veterinary radiologist helps ensure we are making the most accurate diagnosis to guide treatment. Despite these challenges, skull radiographs are invaluable for diagnosing dental disease. On radiographs, dental pathology often appears as areas of bone loss, and in more advanced cases, may extend into the sinuses, indicating more severe involvement. These changes are frequently not detectable during a routine oral examination alone.

So, what do radiographs ultimately allow us to do? They provide critical information that narrows our list of possible diagnoses to help tailor treatment plans to your horse’s specific condition. However, because radiographs do not visualize every tissue type, additional imaging, like ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI), may sometimes be recommended. Radiographs are a powerful and valuable tool when used appropriately. They help us move from uncertainty to clarity, and aid in ensuring your horse receives the best treatment possible.